While Krumm is a somewhat known entity, we still don't know how she reacts to 130 heater serves and really high bouncing groundies, or how she react to a good volleyer with a great overhead.
The 5.0 is a complete unknown. You can post a low level pusher 5.0 with no putaway shot and Kimiko wins breadsticks.
You can post a RISING 5.0, one with a huge serve, decent volleys, but a great cover at the net, including overheads, and he might win by 3's.
A baseline counterpuncher 5.0 might be very even.